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No. 3 of 26 ·AI Stem Splitters

Pymss

Web · Windows · Mac · Linux · Android · iPhone · API

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Freedom report

Three barsScore 6.7

  • Free tierA free tier is on its own pricing page
  • Open codeNo open-source code on record
  • Runs widely6 of 6 device platforms
  • DocumentedPlans, terms and facts published

Pymss is a free, open-source toolchain for separating music into vocals, drums, bass, and other stems on your own machine. Its Studio desktop app brings together model management, batch processing, and stem editing. Import audio files or folders, choose a downloaded model, configure inference, and queue jobs. Studio can also browse and download models, resume interrupted downloads, remove model files, and manage storage. For reviewing results, it offers waveform previews, mix controls, saved projects, and stem export. Pymss can chain models, passing one step’s output into the next. The inference package lists WAV, FLAC, MP3, M4A, AAC, Opus, Vorbis, and Ogg output. Other ways to use it include ComfyUI custom nodes, a browser interface bundled with the server, and a VST3 ARA plugin for compatible DAWs. The plugin has per-stem mute and solo controls; its README names Reaper and Studio One as example hosts. The project says processing stays on your machine. Studio is early in development, and changes between versions may break compatibility.

Who it is for

Pymss suits people who want local music stem separation with batch jobs and editing tools. It may also suit DAW users who want ARA integration or people building workflows with ComfyUI.

What is good

  • Free and open source; separation runs locally.
  • Studio supports batch jobs and stem editing.
  • Can chain models into processing workflows.
  • Lists eight output audio formats.
  • ARA plugin provides per-stem mute and solo.

What to know first

  • Studio is at an early development stage.
  • Breaking changes may occur between versions.
  • Each repository has its own license.

Verdict

Pymss combines local separation with model management, batch processing, and several integration options. Its early development status and possibility of breaking changes are worth considering before relying on Studio.

Pymss plans and pricing

All plans
Pymss Free Free · open source · runs locally pymss.net · 30 Sept 2026

Compared on AI stem splitters

Free plan
Yes
Batch processing
Yes
Export formats
WAV, FLAC, MP3, M4A, AAC, Opus, Vorbis, OGG
API access
Yes

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